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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
//
// TXViewport.cxx
//
#include "TXViewport.h"
#include <stdio.h>
TXViewport::TXViewport(Display* dpy_, int w, int h, TXWindow* parent_)
: TXWindow(dpy_, w, h, parent_), child(0), hScrollbar(0),
vScrollbar(0), scrollbarSize(15), xOff(0), yOff(0), bumpScrollTimer(this),
bumpScroll(false), needXScrollbar(false), needYScrollbar(false),
bumpScrollX(0), bumpScrollY(0)
{
clipper = new TXWindow(dpy, width()-scrollbarSize, height()-scrollbarSize,
this);
clipper->setBg(black);
hScrollbar = new TXScrollbar(dpy, width()-scrollbarSize, scrollbarSize,
false, this, this);
vScrollbar = new TXScrollbar(dpy, scrollbarSize, height()-scrollbarSize,
true, this, this);
}
TXViewport::~TXViewport()
{
delete clipper;
delete hScrollbar;
delete vScrollbar;
}
void TXViewport::setChild(TXWindow* child_)
{
child = child_;
XReparentWindow(dpy, child->win(), clipper->win(), 0, 0);
xOff = yOff = 0;
child->map();
resizeNotify();
}
bool TXViewport::setOffset(int x, int y)
{
if (clipper->width() >= child->width()) {
x = (clipper->width() - child->width()) / 2;
} else {
if (x > 0) x = 0;
if (x + child->width() < clipper->width())
x = clipper->width() - child->width();
}
if (clipper->height() >= child->height()) {
y = (clipper->height() - child->height()) / 2;
} else {
if (y > 0) y = 0;
if (y + child->height() < clipper->height())
y = clipper->height() - child->height();
}
if (x != xOff || y != yOff) {
xOff = x;
yOff = y;
child->move(xOff, yOff);
return true;
}
return false;
}
void TXViewport::setBumpScroll(bool b)
{
bumpScroll = b;
resizeNotify();
}
// Note: bumpScrollEvent() only works if the viewport is positioned at 0,0 and
// is the same width and height as the screen.
bool TXViewport::bumpScrollEvent(XMotionEvent* ev)
{
if (!bumpScroll) return false;
int bumpScrollPixels = 20;
bumpScrollX = bumpScrollY = 0;
if (ev->x_root == width()-1) bumpScrollX = -bumpScrollPixels;
else if (ev->x_root == 0) bumpScrollX = bumpScrollPixels;
if (ev->y_root == height()-1) bumpScrollY = -bumpScrollPixels;
else if (ev->y_root == 0) bumpScrollY = bumpScrollPixels;
if (bumpScrollX || bumpScrollY) {
if (bumpScrollTimer.isStarted()) return true;
if (setOffset(xOff + bumpScrollX, yOff + bumpScrollY)) {
bumpScrollTimer.start(25);
return true;
}
}
bumpScrollTimer.stop();
return false;
}
bool TXViewport::handleTimeout(rfb::Timer* timer) {
return setOffset(xOff + bumpScrollX, yOff + bumpScrollY);
}
void TXViewport::resizeNotify()
{
int winMaxWidth, winMaxHeight;
winMaxWidth = child->width();
winMaxHeight = child->height();
needXScrollbar = false;
needYScrollbar = false;
if (!bumpScroll && height() > scrollbarSize && width() > scrollbarSize) {
needXScrollbar = (width() < child->width());
needYScrollbar = (height() < child->height());
// Adding an horizontal scrollbar occupies space, which might cause the
// need to add a vertical scrollbar, and vice-versa. These additional
// checks should solve this problem
if (needXScrollbar && (height() - scrollbarSize < child->height()))
needYScrollbar = true;
if (needYScrollbar && (width() - scrollbarSize < child->width()))
needXScrollbar = true;
}
if (needXScrollbar)
winMaxHeight += scrollbarSize;
if (needYScrollbar)
winMaxWidth += scrollbarSize;
setMaxSize(winMaxWidth, winMaxHeight);
if (needXScrollbar && needYScrollbar) {
clipper->resize(width()-scrollbarSize, height()-scrollbarSize);
hScrollbar->map();
vScrollbar->map();
} else if (needXScrollbar) {
clipper->resize(width(), height()-scrollbarSize);
hScrollbar->map();
vScrollbar->unmap();
} else if (needYScrollbar) {
clipper->resize(width()-scrollbarSize, height());
hScrollbar->unmap();
vScrollbar->map();
} else {
clipper->resize(width(), height());
hScrollbar->unmap();
vScrollbar->unmap();
}
setOffset(xOff, yOff);
if (needXScrollbar) {
hScrollbar->move(0, height()-scrollbarSize);
hScrollbar->resize(width()-scrollbarSize, scrollbarSize);
hScrollbar->set(child->width(), -xOff, width()-scrollbarSize);
}
if (needYScrollbar) {
vScrollbar->move(width()-scrollbarSize, 0);
vScrollbar->resize(scrollbarSize, height()-scrollbarSize);
vScrollbar->set(child->height(), -yOff, height()-scrollbarSize);
}
}
void TXViewport::scrollbarPos(int x, int y, TXScrollbar* sb)
{
if (sb == hScrollbar) {
x = -x;
y = yOff;
} else {
x = xOff;
y = -y;
}
setOffset(x, y);
}
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